The Qingqi 200's in Sweden seem to have a max speed between 110-130 km/h (69-81 mph)
The rear sprocket can be changed if you want lower revs.
Suzuki TS125 rear sprocket fits.
I kept the revs below 6000 for 40 km, changed the oil and filter, and since then full throttle most of the time.
(Changed oil and filter at 600 km also)
Be sure not to use too high gear during "break in" if you only use lower revs.
I normally don't do any "break in" on any engine, this is the first one I at least tried to...for a while...
I think it's most important not to let engines overheat when new.